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19,845 Commits 622 Branches 2,942 Tags
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5 Commits

Author SHA1 Message Date
Dmitri Hrybenko
9177107940 stdlib/Hashing: move the hash seed variable to C++ code to avoid 
dispatch_once calls on every load from it

Performance improvements, as reported by the perf testing buildbot:

Histogram       -18.81%
TwoSum          -17.42%
RGBHistogram    -9.65%

Regressions:

InsertionSort                5.59%
ArrayOfRef                   3.99%
SwiftStructuresInsertionSort 5.29%
PrimeNum                     6.09%

These regressions are bogus.  The tests that "regressed" don't do any
hashing at all.

Swift SVN r23995
 2014-12-17 23:45:29 +00:00
Greg Parker
c6a88262cf [stdlib] Scrap bit-rotted FastEntryPoints.s. Rewrite refcounts using __atomic. 
Generated code on x86_64 for swift_retain and swift_release and 
swift_allocObject are unchanged. arm64 is improved by using weaker 
memory barriers, fixing rdar://17423624.


Swift SVN r22887
 2014-10-23 08:22:48 +00:00
Dave Abrahams
eac8ca27f9 [stdlib] Use a universal empty array buffer 
NFC, and no significant performance change expected.  This is part one
of a move to eliminate nil checks from the array implementation.

Swift SVN r22526
 2014-10-05 17:55:11 +00:00
Dave Abrahams
b740ad0df9 Revert "[stdlib] Use a universal empty array buffer" 
This reverts commit r22495, because it wroke havoc with SIL and the perf
test suite somehow.

Swift SVN r22499
 2014-10-03 18:52:11 +00:00
Dave Abrahams
f2f068c3dc [stdlib] Use a universal empty array buffer 
NFC, and no significant performance change expected.  This is part one
of a move to eliminate nil checks from the array implementation.

Swift SVN r22495
 2014-10-03 16:01:50 +00:00